book Maths Puzzle Numerical Ability

What is 8/-3 - -7/5? I think I know what it is but I am not sure.

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book Other Question

I know how to find the x intercepts when graphing a quadratic equation and how to solve the first part of finding the vertex ex:(avg. of x int,?) how do I find the other part? I kn The amount of tax is directly proportional to the cost of an item. If the tax on a $12,300 car is $738, find the tax on a $9,450 car.